Field-induced single-molecule magnets of dysprosium involving quinone derivatives

Abstract

The coordination reaction of the [Dy(hfac)3 (H2 O)2 ] units (hfac− = 1,1,1,5,5,5-hexaflu-oroacetylacetonate) with the two quinone-based derivatives 4,7-di-tert-butyl-2-(3,5-di-tert-butyl-4-oxocyclohexa-2,5-dien-1-ylidene)benzo[d][1,3]dithiole-5,6-dione (L1 ) and 7,8-dithiabicyclo[4.2.0]octa-1,5-diene-3,4-dione,2,5bis(1,1-dimethylethyl) (L2 ) led respectively to the complexes [Dy(hfac)3 (H2 O)(L1 )] (1) and [Dy(hfac)3 (H2 O) (L2 )]·(C6 H14 )(CH2 Cl2 ) (2)·(C6 H14 )(CH2 Cl2 ). X-ray structures on single crystal of 1 and 2·(C6 H14 )(CH2 Cl2 ) revealed the coordination of the DyIII on the bischelating oxygenated quinone site and the formation of dimeric species through hydrogen bonds. Ac magnetic measurements highlighted field-induced single-molecule magnet behavior with magnetic relaxation through a Raman process.